How to go online ????
 

I´ve got one question, which number or Name do i have to give in at the beginning of my online sucess! I´m by T-Online!
Is it the number with the 12 letters or anything else?
In Germany the points i mean are "Benutzername" and "Passwort" and i don´t know what i have type!
Please help me as soon as you can!
Greetings